:root {
    /* Brand Colors */
    --brand-red: #E11D48;
    --brand-red-soft: #FFF1F2;
    --brand-red-hover: #BE123C;
    
    /* Neutrals */
    --slate-50: #F8FAFC;
    --slate-100: #F1F5F9;
    --slate-200: #E2E8F0;
    --slate-300: #CBD5E1;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-900: #0F172A;
    
    /* Theme Variables */
    --bg-primary: #ffffff;
    --bg-secondary: #F8FAFC;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --border-color: #E2E8F0;
    --input-bg: #ffffff;
    --input-text: #0F172A;

    /* Layout */
    --container-max: 1120px;
    --radius-lg: 16px;
    --radius-md: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-premium: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --trans-fast: 160ms var(--ease-standard);
}

html.dark {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border-color: #334155;
    --input-bg: #1E293B;
    --input-text: #F8FAFC;
}

/* Base Reset & Typography */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4 { 
    font-weight: 800; 
    line-height: 1.2; 
    letter-spacing: -0.02em; 
    color: var(--text-primary);
    margin-bottom: 1rem;
}

p { color: var(--text-secondary); margin-bottom: 1.25rem; }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Sections */
.section { padding: 5rem 0; }
.bg-soft { background-color: var(--bg-secondary); }

/* Premium Cards */
.card-premium {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: var(--trans-fast);
}
.card-premium:hover {
    border-color: var(--brand-red);
    box-shadow: var(--shadow-premium);
    transform: translateY(-2px);
}

/* Input Styles */
.form-group { margin-bottom: 1.5rem; }
.label-premium { 
    display: block; font-size: 0.875rem; font-weight: 700; color: var(--text-secondary); margin-bottom: 0.5rem; 
}
.input-premium {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--input-bg);
    color: var(--input-text);
    font-size: 1rem;
    transition: var(--trans-fast);
}
.input-premium:hover { border-color: var(--slate-300); }
.input-premium:focus {
    outline: none;
    border-color: var(--brand-red);
    box-shadow: 0 0 0 4px var(--brand-red-soft);
}

/* AdSense Slots (CLS Prevention) */
.ad-slot {
    margin: 2rem auto;
    background: var(--slate-50);
    border: 1px dashed var(--slate-200);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
.ad-slot::after {
    content: 'Advertisement';
    font-size: 0.7rem;
    color: var(--slate-300);
    text-transform: uppercase;
}
.ad-728x90 { min-height: 90px; max-width: 728px; }
.ad-300x250 { min-height: 250px; width: 300px; }
.ad-responsive { min-height: 100px; width: 100%; }

/* Buttons */
.btn-premium {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    padding: 0 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    cursor: pointer;
    transition: var(--trans-fast);
    border: none;
    text-decoration: none;
}
.btn-primary { background: var(--brand-red); color: white; }
.btn-primary:hover { background: var(--brand-red-hover); transform: translateY(-1px); }
.btn-outline { background: transparent; border: 2px solid var(--slate-200); color: var(--slate-700); }
.btn-outline:hover { border-color: var(--brand-red); color: var(--brand-red); }

/* Badge */
.badge-premium {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--brand-red-soft);
    color: var(--brand-red);
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
}